On spatial instability of a swirling jet - Theory and experimentThe spatial instability of a swirling jet is investigated both experimentally and theoretically. A hydrodynamic stability analysis is applied to an inviscid incompressible top-hat jet, with a swirl distribution of solid-body rotation and free vortex in and outside the vortex core, respectively. Both plane and helical instability modes are examined. It is found that the top-hat jet with swirl distribution of Rankine vortex type is unstable in all the modes studied. The higher the positive helicity, the less spatially unstable the jet behavior; the higher the negative helicity, the more spatially unstable this behavior becomes. A comparison is made between theoretical results and experimental data on a low-intensity swirling jet. The trend of the initial growth of the instability waves in the near field is captured.
Document ID
19910057960
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wu, C. (Kansas Univ. Lawrence, KS, United States)
Farokhi, S. (Kansas, University Lawrence, United States)
Taghavi, R. (Sverdrup Technology, Inc. Cleveland, OH, United States)